The suspect is believed to have trained the suicide bomber who blew up a subway car in central St Petersburg on April 3, leaving 14 people dead.
The people of St Petersburg have been united by their sorrow, but underneath their pain lies a resilience in the face of an unspeakable act.
The deadly blast that struck a busy metro station in Saint Petersburg earlier this week, is not the first of its kind in the world's largest nation.
22-year-old Akbarzhon Jalilov is suspected of killing 14 people and injuring dozens in a suicide attack on a metro train in Russia.
Rallies are held around the world to mark International Women's Day and to highlight the gender pay gap.
Binali Yildirim said relations with Moscow had undergone a "test" but "thanks to mutual political will, we have endured the difficult situation."
At least two Russian-flagged ships made jet fuel deliveries to Syria contravening EU sanctions. Russia is carrying out air strikes in support of the regime.
Mehmet Simsek, Turkey's deputy prime minister, says President Erdogan's visit to Moscow was part of an ongoing attempt to try to mend ties with Russia.
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